Journal of Indian Society of Periodontology
Journal of Indian Society of Periodontology
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ORIGINAL ARTICLE
Year : 2010  |  Volume : 14  |  Issue : 3  |  Page : 160-167

Clinical evaluation of the biological width following surgical crown-lengthening procedure: A prospective study


1 Sri Siddhartha Dental College and Hospital,Tumkur, India
2 Department of Periodontics, K.L.E Society’s Institute of Dental Sciences, Bangalore, Karnataka, India
3 Department of Periodontics, M.S. Ramaiah Dental College and Hospital, Bangalore, Karnataka, India

Correspondence Address:
K S Shobha
Sri Siddhartha Dental College and Hospital, Radha Krishna Nilaya, No. 16, 12th Cross, 1st Main, Maruthi Nagar, Madiwala, Bangalore - 560 068
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-124X.75910

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Background and Objectives: The purpose of this study was to evaluate the positional changes of the periodontal tissues, particularly the biological width, following surgical crown-lengthening in human subjects. Materials and Methods: A clinical trial study involving 15 patients was carried out for a period of 6 months. Sites were divided into 3 groups: treated (TT) sites, adjacent (AD) sites and nonadjacent (NAD) sites. Free gingival margin [FGM], attachment level, pocket depth, bone level, biological width [BW] were recorded at baseline, 1, 3 and 6 months. Direct bone level after flap reflection was recorded before and after osseous resection at baseline only. Level of osseous crest was lowered based on BW, and supracrestal tooth structure needed using a combination of rotary and hand instruments. Statistical Analysis: Student t test and ANOVA were used. Results: Overall, apical displacement of FGM at TT, AD and NAD sites was statistically significant compared to baseline. The apical displacement of FGM at TT site was more when compared to that at AD and NAD sites at 3 and 6 months. The BW at the TT site was smaller at 1, 3 and 6 months compared to that at baseline. However, at all sites, BW was reestablished to the baseline value at the end of 6 months. Interpretation and Conclusion: The BW at TT sites was reestablished to its original vertical dimension by 6 months. In addition, a consistent 2-mm gain of coronal tooth structure was observed at the 1, 3 and 6-month examinations.


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